Collateral Damage will follow Master ChiefJohn-117 and the rest of Blue Team during the Human-Covenant war, as they are deployed to the surface of an unstable colony world by the UNSC, with the objective of denying the Covenant access to a powerful and ancient artifact hidden beneath the planet's surface. However, the mission takes an unexpected turn and the stakes are raised, forcing Blue Team to coordinate with a group of human rebels in order to survive.[2]